【摘要】：生產(chǎn)工藝中需要聚苯乙烯粒子在液相苯乙烯中均勻懸浮與混合,要求底部固相不堆積,固相濃度分布均勻。為了達(dá)到理想的攪拌效果,本文研究了雙槳的偏心率及轉(zhuǎn)速對(duì)攪拌混合效果的影響。以底部橢圓封頭,無擋板的反應(yīng)釜和雙層6折葉的開啟渦輪式攪拌器為研究對(duì)象,用Fluent軟件對(duì)攪拌器偏心時(shí)水的攪拌流場(chǎng)及聚苯乙烯粒子-苯乙烯固液攪拌進(jìn)行數(shù)值模擬。模擬了不同偏心率和轉(zhuǎn)速對(duì)攪拌流型、聚苯乙烯粒子濃度分布及能耗的影響,并用粒子圖像測(cè)速法(PIV)實(shí)驗(yàn)驗(yàn)證水的攪拌流場(chǎng)。結(jié)果表明,偏心攪拌可使流體速度得到增加,槳葉下方的攪拌死區(qū)得到有效抑制;偏心率增大導(dǎo)致兩側(cè)的速度偏差越來越大,能量分布不均勻;偏心攪拌的聚苯乙烯粒子濃度分布比對(duì)中攪拌的更為均勻,可改善粒子在苯乙烯中的懸浮效果;相同攪拌效果的情況下,偏心率為0.15的功率消耗是對(duì)中攪拌的85%;對(duì)該固液攪拌時(shí)的最佳偏心率和最佳轉(zhuǎn)速分別為0.15和95 r/min,此時(shí)固液攪拌混合效果最好,固相濃度分布最為均勻,消耗功率相對(duì)較少。
[Abstract]:In the production process, polystyrene particles should be suspended and mixed uniformly in liquid styrene, and the solid phase should not be stacked at the bottom and the concentration of solid phase should be uniform. In order to achieve the ideal mixing effect, the effects of eccentricity and rotational speed of the two propellers on the mixing effect are studied in this paper. Taking the bottom elliptical head, the reactor without baffle and the open turbine agitator with double layer 40% discount blade as the research object, the flow field of water stirring and the solid liquid stirring of polystyrene particle and styrene were numerically simulated by Fluent software. The effects of eccentricity and rotational speed on agitation flow pattern, concentration distribution of polystyrene particles and energy consumption were simulated. The (PIV) experiment of particle image velocimetry was used to verify the mixing flow field of water. The results show that eccentricity agitation can increase the velocity of the fluid and restrain the dead zone under the blade effectively, and the increase of eccentricity leads to the increasing deviation of velocity on both sides and the uneven distribution of energy. The concentration distribution of polystyrene particles in eccentrically stirred is more uniform than that in stirring, which can improve the suspending effect of particles in styrene, and the power consumption of the eccentric ratio of 0.15 is 85% of that of the middle stirring under the same stirring effect. The optimum eccentricity and rotation speed are 0.15 and 95 r / min, respectively. At this time, the mixing effect is the best, the distribution of solid concentration is the most uniform, and the power consumption is relatively low.
【作者單位】： 上海應(yīng)用技術(shù)大學(xué)機(jī)械工程學(xué)院;南京工業(yè)大學(xué)機(jī)械與動(dòng)力工程學(xué)院;
【分類號(hào)】：TQ325.2;TQ027.2

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